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Mustang II Suspension and Corvette Spindle Geometry are Things of the Past!

Many aftermarket chassis' suspensions are based on the Pinto/ Mustang II, a suspension that was developed using early 1970's technology; intended for a light weight econobox car powered by a 4 cylinder and was produced at a time when real performance handling wasn't much a part of American cars’ vocabulary. Perfect strength and geometry for throwing a heavy 1960s or '70s muscle car with wide sticky tires through the corners right? Yeah, no.

In effort to handle better, some aftermarket suspension systems are based around the Corvette (or Corvette Copy) spindle and geometry. While that 1990's technology has proven to work better than the older Mustang II, it’s still outdated by today’s standards and is only truly at at optimum in the car it was designed for.

Serious Hot Rods, Pro Touring cars and YOU deserve a more modern ride and handling capability. While our competitors continue to play with the outdated and overrated, we’ve pushed ahead of all other performance suspensions by developing an entirely new ExtReme suspension that really is the best all around system available, period.

The ExtRreme Difference

From weekend cruisers to track day warriors Speedtech has once again stepped up to lead the industry into the next level of street car cornering performance. Together with veteran road race and stock car chassis builder Ron Sutton, we've produced a totally new, optimized, push-the-envelope type of suspension that outperforms anything else in the Pro Touring market.

Said Ron, "...we needed to achieve the optimum front dynamic roll center for any suspension strategy the customer wants to run, and we did it, it turned out perfect. This is combined with the best Ackerman of any available front end, optimum camber gain and minimal jacking effect."

What does this mean to you? Ron continues, "... This makes these the Best handling, steering & driving frames available. They are an upgrade from frankly any full chassis or front subframe in the Pro Touring market today.”

Check out our overview video shot at the SEMA show and then Scroll to the bottom of the page to see why this suspension surpasses them all.

A. Each ExtReme frame is Jig welded in our manufacturing facility in St. George, Utah, USA. Individual frame rail components are laser cut and CNC formed to ensure consistent close tolerances and are tab-through internally gusseted construction for superior strength. Includes all factory based mounting points for an easy bolt-in installation.

B. ExtReme frame rails and crossmembers are designed to allow the most available ground clearance with aggressively low ride heights. Run-through, large tubing exhaust ports along with our custom headers keep the entire exhaust above the frame rails.

C. ExtReme CNC formed tubular transmission cross member works in conjunction with engine mounts to help achieving optimum pinion angle. Our adjustable cross member allows a wide range of mounting positions that allows near any GM engine and transmission combination.

D. ExtReme tubular control arms are CNC cold formed and precision TIG welded for superior strength and consistency. They feature ultra high clearance profiles for more steering angle, additional built in caster and camber gain geometry, billet stainless cross shafts with adjustable caster shims, Delrin bushings and performance ball joints.

E. ATS ExtReme front spindles allow any C5/C6 Corvette based caliper to bolt directly on. Rear brakes are based on the popular 9” Ford axle. These types of mounting bosses allow a wide range of brake options, from mild to wild. Speedtech Performance is a direct dealer for both Baer and Wilwood brake systems so we can help customize your brake package specifically to your needs.

F. Performance Rack and Pinion steering systems are standard with all ExtReme chassis and subframe packages. Rack and pinion offers precision steering with a quicker feel and better feedback in a lighter weight package.

L. Exclusive to ExtReme suspensions is the option of a splined rear sway bar. Not only can you order your choice of bar spring rate, the arms have three end link mounting positions for fine tuning the bar to your specific vehicle.